I'm having a love/hate relationship with Mars First Logistics. It's a game where you custom-build rovers on Mars to carry strangely-shaped objects from one location to another.

It's bizarrely difficult and casual at the same time. You really have to think about your builds (a la KSP), but there are no time limits and you can always reset, so the stakes for failure are very low.

It's a game that alternates between making me feel very dumb and very smart.

Check it out on Steam. It's on sale.
https://store.steampowered.com/app/1532200/Mars_First_Logistics/